diff --git a/packages/playwright/src/common/config.ts b/packages/playwright/src/common/config.ts
index 31a7b88c61..43f51b0a62 100644
--- a/packages/playwright/src/common/config.ts
+++ b/packages/playwright/src/common/config.ts
@@ -226,7 +226,7 @@ function resolveReporters(reporters: Config['reporter'], rootDir: string): Repor
 function resolveWorkes(workers: string) {
   const parsedWorkers = parseInt(workers, 10);
   if (isNaN(parsedWorkers)) {
-    throw new Error('Workers must be a number or percentage.');
+    throw new Error(`Workers ${workers} must be a number or percentage.`);
   }
 
   return parsedWorkers;